EP0267780A1 - Magnetic recording and reproducing apparatus - Google Patents
Magnetic recording and reproducing apparatus Download PDFInfo
- Publication number
- EP0267780A1 EP0267780A1 EP87309938A EP87309938A EP0267780A1 EP 0267780 A1 EP0267780 A1 EP 0267780A1 EP 87309938 A EP87309938 A EP 87309938A EP 87309938 A EP87309938 A EP 87309938A EP 0267780 A1 EP0267780 A1 EP 0267780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- time code
- signal
- tape
- recording
- reproducing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
- G11B27/036—Insert-editing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
- G11B27/3036—Time code signal
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/90—Tape-like record carriers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
- G11B27/032—Electronic editing of digitised analogue information signals, e.g. audio or video signals on tapes
Definitions
- a pulse code modulated (PCM) signal relating to one field of a video signal, but having a compressed time base, is recorded in an area AP at which the head HA or HB begins to trace the track TA or TB along a distance corresponding to the angular movement of the respective head HA or HB through an angle of 37°.
- a video signal of one field is recorded in the following interval or area AV of each track TA or TB corresponding in length to the movement of the respective head HA or HB through an angle 180°.
- the remaining or last interval of each track TA or TB corresponding to an angular movement of the respective head HA or HB through an angle of 5° is a detaching area in which the head HA or HB moves out of contact with the tape 2.
- a guard area 15 having an extent corresponding to an angular displacement of the respective head HA or HB through 2.62° and which is, in turn, followed by a video signal area 16 having an extent corresponding to angular displacement of the head HA or HB through 180° and which is provided for the recording of one field of the video signal.
- a detaching area 17 having an extent equal to angular displacement of the head HA or HB through 5°.
- the switching control signal RFSW for the PCM multi-track mode is shifted in phase in accordance with the specified segment track area selected from the segment track areas AP1 to AP6 by 36° x(n-1), where n is an integer equal to from one to six for the segment track areas AP1 to AP6, respectively.
- a field of the video signal to be recorded is supplied from the contact 32Vb through the recording switching circuit 32 and through the recording amplifier 34B and the switching circuit 31B to the head HB for recording in the scanned area AV of the track TB.
- the recording system of Figure 6 further comprises a PCM signal system 60 including a PCM audio signal processing circuit 62 which receives left and right-channel audio signals through input terminals 61L and 61R, respectively, and PCM encodes the audio signals into PCM audio data supplied to a fixed contact AD of a PCM switching circuit 35. More specifically, in the processing circuit 62, the audio signals are digitized and each field of the digitized signals is preferably divided into 132 blocks. As shown in Figure 7, each block includes parity words P and Q generated as an error correction code, and a cyclic redundancy check (CRC) code is also generated for each block.
- CRC cyclic redundancy check
- the time base of the date corresponding to one field of the video signal is compressed to about 1/5 the original length, and a synchronizing signal SYNC and a block address word ADRS are added to each block, arranged as shown in Figure 7.
- the blocks of PCM data are written in a random access memory (RAM) (not shown) of the processing circuit 62 and are read therefrom in response to a PCM area signal generated on the basis of the switching control signal RFSW.
- the PCM data is read from the RAM of the processing circuit 62 in the recording mode during each period when the head HA or HB scans a PCM area AP of a track TA or TB.
- Each block of the PCM audio data is shown in greater detail in Figure 7 to be formed of the block synchronizing signal SYNC of three bits, the block address word ADRS of eight bits, the error-correction parity words P and Q each of eight bits, eight audio data words W0 to W7 of eight bits each, and the CRC code is sixteen bits for error detection and which is generated for address words ADRS to data word W7.
- the PCM audio signal is supplied from the contact 32Ab through the switching circuit 32, the recording amplifier 34B and the switching circuit 31B to the magnetic head HA for recording in the specified segment track area of the track TB being scanned.
- the heads HA and HB are again phase-servo-controlled in a normal manner, for example, with reference to the pulse signal P PG .
- pilot signals having four different frequencies are cyclically recorded in tracks TA and TB, and such pilot signals are employed for effecting tracking servo, that is, for ensuring that each of the heads HA and HB accurately scans a track TA and a track TB, respectively.
- the head HA scans the part AV of a track TA for reproducing a video signal therefrom which is supplied through the switching circuit 31A, the playback amplifier 36A and the reproducing switching circuit 33 to the fixed contact 33Va, and from thence to the video signal system 50.
- the head HB scans the part AP of a track TB, the resulting reproduced PCM audio signal is supplied through the switching circuit 31B, the playback amplifier 36B, and the reproducing switching circuit 33 to the fixed contact 33Ab, and from thence to the PCM audio signal system 60.
- the reproduced video signal is processed in a manner complementary to the processing at the time of recording, so as to provide an output video signal at an output terminal 52.
- the reproduced PCM audio signal is supplied through a reproducing equalizer 63 and a limiter 64 to a bit synchronizing circuit 65 which includes a D-type flip-flop circuit 66 and a phase-locked loop (PLL) circuit 67.
- the data comprising "1"s and "0"s modulated as described above are derived from the flip-flop 66 and supplied to the PCM audio signal processing circuit 62 in which the data are detected and corrected for error, expanded to the original time base, and reconverted into left and right analogue audio signals which are supplied to output terminals 68L and 68R, respectively.
- the PCM audio signals reproduced by the heads HA and HB in scanning the areas AP1 to AP6 in the tracks TA and TB, respectively, are supplied through the switching circuits 31A and 31B and the playback amplifiers 36A and 36B, respectively, to the movable contacts of the reproducing switching circuit 33.
- the reproducing switching circuit 33 Since, in the PCM multi-track mode, the reproducing switching circuit 33 is changed-over from one position to the other in response to the switching control signals RFSW which has its phase shifted by an integral multiple of 36° in accordance with the specified one of the segment track areas AP1 to AP6, the PCM audio signal reproduced from the specified one of the segment track areas AP1 to AP6 in the tracks TA and TB is supplied to the PCM signal system 60.
- the PCM audio signal from the specified one of the segment track areas AP1 to AP6 is detected and corrected for error, expanded in time base, and reconverted into left and r ight analogue audio signals which are fed to the output terminals 68L and 68R, respectively.
- the reproduced time code signal is demodulated, detected and corrected for error, and the resulting time code data TC ⁇ is supplied from the decoder 74 to an indicator 75 which visually indicates the position or time along the tape in "hours", “minutes”, “seconds” and "frames".
Abstract
Description
- This invention relates to magnetic recording and reproducing apparatus.
- In a video signal editing apparatus for sequentially recording information signals, such as video and audio signals, in successive oblique tracks on a magnetic tape by means of rotary magnetic heads, time code signals which indicate "hours", "minutes", "seconds" and "frames" are recorded together with the information signals, for example, as disclosed in our US patent application serial No. 06/885,203, filed July 14, 1986. In such apparatus, it is necessary to maintain continuity of the time code data associated with information signals recorded separately, as in the so-called assemble or editing mode.
- To maintain continuity of the time code data in the assemble mode, it has been proposed to disable the time code generator during each period when the magnetic tape is at rest, and to commence operation of the time code generator for providing the time code signal to be recorded precisely when the movement of the magnetic tape is commenced again for recording of an information signal. However, when the operation of the time code generator is coordinated with the movements of the magnetic tape in the assemble mode, as described above, the operations of the time code generator cannot be made to correspond precisely to the tape movements due to over-running of the tape driving mechanism as a result of inertia and/or mechanical clearances, with the result that it is difficult to maintain continuity of the time code, particularly in frame units thereof.
- According to the present invention there is provided a recording and reproducing apparatus for recording, in successive oblique tracks on a magnetic tape, at least a first information signal and, thereafter, a second information signal along with respective time code signals which are to represent a continuous time code, the apparatus comprising:
tape drive means for driving the tape in forward and reverse directions; and
rotary magnetic transducer means for scanning said successive oblique tracks on the tape when the tape is driven in said forward direction and having recording and reproducing modes for selectively recording and reproducing information signals and respective time code signals in said oblique tracks being scanned;
characterized by:
control means operative, after the recording of said first information signal and the respective time code signal on the tape, to cause said tape drive means to drive the tape in said reverse direction a predetermined distance and then to drive the tape in said forward direction while said transducing means are in said reproducing mode for reproducing said time code signal recorded with said first information signal;
time code generating means for generating a time code signal to be recorded with said second information signal; and
means for synchronizing said time code signal generated by said time code generating means with said time code signal reproduced with said first information signal by said transducing means while the tape is driven in said forward direction. - The invention will now be described by way of example with reference to the accompanying drawings, throughout which like parts are referred to by like references, and in which:
- Figure 1 is a schematic diagram showing a rotary head assembly of a video tape recorder (VTR) of a type to which the present invention may be applied;
- Figure 2 is a diagrammatic view showing a length of magnetic tape with a pattern of oblique tracks thereon in which video and audio signals may be recorded in a so-called normal mode of the VTR of Figure 1;
- Figure 3 is a diagrammatic view similar to that of Figure 2, but showing a track pattern for a so-called pulse code modulation (PCM) multi-track mode in which aud io signals of a plurality of channels are recorded in respective segment track areas;
- Figure 4 and 5 are diagrams showing track formats of the VTR for the normal mode and for the PCM multi-track mode of Figures 2 and 3, respectively;
- Figure 6 is a block diagram showing an embodiment of video signal editing apparatus according to the present invention;
- Figure 7 is a schematic diagram to which reference will be made in explaining the data format of a PCM signal that may be used in an apparatus according to this invention; and
- Figure 8 is a diagram to which reference will be made in explaining the operation of the editing apparatus of Figure 6 in its assemble mode.
- Referring to Figure 1, a rotary head assembly of an 8 mm video tape recorder (VTR) of a type to which the present invention may be applied includes recording and reproducing rotary magnetic heads HA and HB having head gaps with different azimuths. The heads HA and HB are mounted on a rotary head drum 1 at diametrically opposed locations, that is, with an angular spacing of 180°. The heads HA and HB are rotated at the frame frequency of a video signal, for example, 30 Hz in the case or NTSC signals, in the direction of the
arrow 3H in Figure 1 and protrude slightly beyond the peripheral guide surface of the drum 1. Amagnetic tape 2 is wrapped obliquely around the peripheral surface of the drum 1 over an angular extent of 221°. During a recording or reproducing operation of the VTR, thetape 2 is driven longitudinally at a constant speed in the forward direction indicated by thearrow 3T, as hereinafter further described. Accordingly, as shown in Figures 2 and 3, by reason of the combination of the rotary movements of the heads HA and HB and the longitudinal movement of thetape 2, in the recording and reproducing modes of the VTR, the heads HA and HB alternately scan successive oblique tracks TA and TB, respectively, on thetape 2, with each of the tracks TA and TB having a length corresponding to the circumferential distance travelled by the head HA or HB in moving through an angle of 221°. - In a normal mode, as shown in Figure 2, a pulse code modulated (PCM) signal relating to one field of a video signal, but having a compressed time base, is recorded in an area AP at which the head HA or HB begins to trace the track TA or TB along a distance corresponding to the angular movement of the respective head HA or HB through an angle of 37°. A video signal of one field is recorded in the following interval or area AV of each track TA or TB corresponding in length to the movement of the respective head HA or HB through an
angle 180°. The remaining or last interval of each track TA or TB corresponding to an angular movement of the respective head HA or HB through an angle of 5° is a detaching area in which the head HA or HB moves out of contact with thetape 2. - In a PCM multi-track mode, as shown in Figure 3, fixed segment track areas AP2 to AP6, each corresponding in length to the movement of the respective head HA or HB through an angle of 36°, are provided in each track TA or TB in addition to the original segment track area AP1. Thus, there are six segment track areas AP1 to AP6 for the recording of the PCM audio signals in each of the tracks TA and TB. In other words, a PCM audio signal corresponding to one field and having its time base suitably compressed can be recorded in each of the six segment areas AP1 to AP6. Accordingly, in the PCM multi-track mode, an audio signal of one channel can be recorded in the similarly numbered segment track areas in the several tracks, for example, in the segment track areas AP2 of the successive tracks TA and TB.
- The track format in the normal mode shown in Figure 2 will now be described in greater detail with reference to Figure 4 in which the head HA or HB is assumed first to come into contact with the
tape 2 at the right hand side of the drawing. In the illustrated track format, a scanning ortracing start area 11 corresponding to angular movement of the respective head HA or HB through an angle of 5° is provided at the end of the track TA or TB where contact is initially made. At the concluding portion of thestart area 11, there is provided a preamble or clock run-inarea 12 having an extent corresponding to the angular movement of the respective head HA or HB through an angle 2.06° which corresponds to three horizontal or line intervals of a video signal. The clock run-in signal provided in thepreamble area 12 is synchronized with the PCM data recorded in a followingPCM data area 13 having an extent corresponding to angular movement of the respective head HA or HB through 26.32°, and which is used for the audio signal with a compressed time base. ThePCM data area 13 is followed by apostamble area 14 which has an extent equal to angular movement of the head HA or HB through an angle of 2.06° (again corresponding to three horizontal or line intervals), and which provides a back margin area in case of erroneous displacement of the recording position when using a so-called after-recording mode. After thepostamble area 14, there is provided aguard area 15 having an extent corresponding to an angular displacement of the respective head HA or HB through 2.62° and which is, in turn, followed by avideo signal area 16 having an extent corresponding to angular displacement of the head HA or HB through 180° and which is provided for the recording of one field of the video signal. Finally, after thevideo signal area 16, there is provided a detachingarea 17 having an extent equal to angular displacement of the head HA or HB through 5°. - The track format of the PCM multi-track mode shown in Figure 3 will be described more fully with reference to Figure 5 in which, as there shown, each of the segment track areas AP1 to AP6 in each of the tracks has a format precisely the same as that of the area AP of the above described track format for the normal mode shown in Figure 4. In other words, each of the segment track areas AP1 to AP6 is divided into a
tracking start area 21, apreamble area 22, aPCM data area 23, apostamble area 24 and aguard area 25 having extents equal to those of theareas - With the above described track formats for the normal mode and the PCM multi-track mode, time code data is also recorded in each of the tracks TA and TB, for example, in the
postamble area - In the embodiment of Figure 6, the heads HA and HB are shown to be connected to the movable contacts of record/
playback switching circuits system controller 40 so that the movable contacts engage respective recording contacts REC during a recording operation, and the movable contacts are changed-over to engage respective reproducing or playback contacts PB during a reproducing operation. Recording and reproducing head change-overswitching circuits system controller 40. The switching control signal RFSW is a rectangular wave signal with a duty ratio of 50% that is formed on the basis of a pulse signal P PG having a frequency of 30 Hz, and which is indicative of the rotational phases of the heads HA and HB. As shown, the pulse signal P PG may be supplied by a pulse generator PG associated with ashaft 81 through which the heads HA and HB are driven by anelectric motor 82. The switching control signal RFSW for the PCM multi-track mode illustrated in Figure 3 is shifted in phase relative to the switching control signal RFSW for the normal mode shown in Figure 2 in accordance with the specified segment track area. In other words, the switching control signal RFSW for the PCM multi-track mode is shifted in phase in accordance with the specified segment track area selected from the segment track areas AP1 to AP6 by 36° x(n-1), where n is an integer equal to from one to six for the segment track areas AP1 to AP6, respectively. - The
recording switching circuit 32 has two movable contacts connected throughrecording amplifiers 34A and 34B with the fixed contacts REC of theswitching circuits switching circuits playback amplifiers 36A and 36B, respectively, to respective movable contacts of theplayback switching circuit 33. - In the recording system of Figure 6, an incoming video signal is supplied through an input terminal 51 to a video signal system 50 where it is processed for recording and then supplied to fixed contacts 32Va and 32Vb of the
recording switching circuit 32. As earlier noted, therecording switching circuit 32 has its movable contacts changed in position at every half revolution of the heads HA and HB in response to the switching control signal RFSW from thesystem controller 40. Further, the rotational movements of the heads HA and HB by themotor 82 under the control of amotor drive circuit 82A are phase-servo-controlled, using the pulse signal P PG as a reference phase, so that a field of the video signal to be recorded is supplied through therecording switching circuit 32 from the fixed contact 32Va thereof, therecording amplifier 34A and theswitching circuit 31A to the head HA for recording in the area AV of a track TA being scanned thereby, as shown in Figure 2. Similarly, when the head HB scans the area AV of a track TB, as illustrated in Figure 6, a field of the video signal to be recorded is supplied from the contact 32Vb through therecording switching circuit 32 and through the recording amplifier 34B and theswitching circuit 31B to the head HB for recording in the scanned area AV of the track TB. - The recording system of Figure 6 further comprises a
PCM signal system 60 including a PCM audiosignal processing circuit 62 which receives left and right-channel audio signals through input terminals 61L and 61R, respectively, and PCM encodes the audio signals into PCM audio data supplied to a fixed contact AD of aPCM switching circuit 35. More specifically, in theprocessing circuit 62, the audio signals are digitized and each field of the digitized signals is preferably divided into 132 blocks. As shown in Figure 7, each block includes parity words P and Q generated as an error correction code, and a cyclic redundancy check (CRC) code is also generated for each block. Moreover, in theprocessing circuit 62, the time base of the date corresponding to one field of the video signal is compressed to about 1/5 the original length, and a synchronizing signal SYNC and a block address word ADRS are added to each block, arranged as shown in Figure 7. The blocks of PCM data are written in a random access memory (RAM) (not shown) of theprocessing circuit 62 and are read therefrom in response to a PCM area signal generated on the basis of the switching control signal RFSW. In other words, the PCM data is read from the RAM of theprocessing circuit 62 in the recording mode during each period when the head HA or HB scans a PCM area AP of a track TA or TB. - Each block of the PCM audio data is shown in greater detail in Figure 7 to be formed of the block synchronizing signal SYNC of three bits, the block address word ADRS of eight bits, the error-correction parity words P and Q each of eight bits, eight audio data words W0 to W7 of eight bits each, and the CRC code is sixteen bits for error detection and which is generated for address words ADRS to data word W7.
- The PCM data read from the RAM of the
processing circuit 62 during each period specified by the PCM area signal are modu lated into a signal of frequency 5.8 MHz for each "1" and a signal having a frequency of 2.9 MHz for each "0". The resulting modulated signal is supplied through the fixed contact AD of thePCM switching circuit 35 to fixed contacts 32Aa and 32Ab of therecording switching circuit 32. When the control signal RFSW positions the movable contacts of therecording switching circuit 32 as shown in full lines in Figure 6, the head HA scans the area AP of a track TA (Figure 2) while the head HB scans the area AV of a track TB. At such a time, the PCM audio signal is supplied from the fixed contact 32Aa through therecording switching circuit 32, therecording amplifier 34A and theswitching circuit 31A to the head HA for recording in the area AP of the track TA then being scanned by the head HA. Similarly, when the head HB scans the area AP of a track TB, the switching control signal RFSW changes-over the movable contacts of therecording switching circuit 32 to the positions shown in broken lines in Figure 6, so that the PCM audio signal is supplied from the fixed contact 32Ab through therecording switching circuit 32, the recording amplifier 34B and theswitching circuit 31B to the head HB for recording in the area AP of the track TB then being scanned. - As earlier noted, in the PCM multi-track mode, the switching control signal RFSW is shifted in phase by an integral multiple of 36° in accordance with the specified one of the segment track areas AP1 to AP6, and the PCM area signal is formed in accordance with the thus phase shifted switching control signal RFSW. Thus, when the head HA traces the sp[ecified one of the segment track areas AP1 to AP6 (Figure 3) of the track TA being scanned, the PCM audio signal is supplied from the contact 32Aa through the switching
circuit 32, therecording amplifier 34A and theswitching circuit 31A to the head HA for recording in the specified segment track area of the track TA being scanned. Similarly, when the head HB traces the specified segment track area of a track TB being scanned, the PCM audio signal is supplied from the contact 32Ab through the switchingcircuit 32, the recording amplifier 34B and theswitching circuit 31B to the magnetic head HA for recording in the specified segment track area of the track TB being scanned. - Time code signals are recorded with the PCM audio signals in the area AP or the areas AP1 to AP6 of each of the tracks TA and TB. For this purpose, a time code generator 71 is provided to generate time code data TC supplied to an encoder 72 in which it is encoded into the same format as shown for a data block in Figure 7, and then modulated. The resulting modulated time code data is supplied from the encoder 72 to a fixed contact TC of the switching
circuit 35. The switchingcircuit 35 is controlled by an index area signal IDAR received from thesystem controller 40 which is operative to changeover the movable contact of the switchingcircuit 35 to the position shown in broken lines in Figure 6 during the scanning by each of the heads HA and HB of a part of the postamblearea 14 in the track area AP (Figure 4) or of a part of the postamblearea 24 of each of the segment track areas AP1 to AP6 (Figure 5) of each of the tracks TA and TB. Therefore, the time code data is recorded in each postamblearea - In the reproducing mode of the VTR of Figure 6, the heads HA and HB are again phase-servo-controlled in a normal manner, for example, with reference to the pulse signal P PG. Further, in the case of the 8 mm VTR, pilot signals having four different frequencies are cyclically recorded in tracks TA and TB, and such pilot signals are employed for effecting tracking servo, that is, for ensuring that each of the heads HA and HB accurately scans a track TA and a track TB, respectively.
- During reproduction of video and audio signals recorded in the normal mode, as shown in Figure 2, the switching
circuits circuits playback amplifiers 36A and 36B, respectively, to the movable contacts of the reproducingswitching circuit 33. As earlier noted, the movable contacts of the reproducingswitching circuit 33 are changed-over between the positions shown in full lines and the positions shown in dotted lines at every half revolution of the heads HA and HB in response to the switching control signal RFSW from thesystem controller 40. - During the half revolution of the heads HA and HB in which the head HB scans the part AV of a track TB, the movable contacts of the reproducing
switching circuit 33 are positioned as shown in full lines so that the video signal being reproduced from the part AV of a track TB by the head HB is supplied therefrom through theswitching circuit 31B, the playback amplifier 36B, the reproducingswitching circuit 33 to the fixed contact 33Vb, and thence to the video signal system 50. During a part of the same half revolution of the heads HA and HB, as the head HA scans the part AP of a track TA, the PCM audio signal reproduced by the head HA is supplied therefrom through theswitching circuit 31A, theplayback amplifier 36A, and the reproducingswitching circuit 33 to the fixed contact 33Aa and thence to the PCMaudio signal system 60. - During the next half revolution of the heads HA and HB, that is, when the reproducing
switching circuit 33 is changed-over to the position illustrated in dotted lines in Figure 6, the head HA scans the part AV of a track TA for reproducing a video signal therefrom which is supplied through theswitching circuit 31A, theplayback amplifier 36A and the reproducingswitching circuit 33 to the fixed contact 33Va, and from thence to the video signal system 50. Further, when the head HB scans the part AP of a track TB, the resulting reproduced PCM audio signal is supplied through theswitching circuit 31B, the playback amplifier 36B, and the reproducingswitching circuit 33 to the fixed contact 33Ab, and from thence to the PCMaudio signal system 60. - In the video signal system 50, the reproduced video signal is processed in a manner complementary to the processing at the time of recording, so as to provide an output video signal at an
output terminal 52. - In the PCM
audio signal system 60, the reproduced PCM audio signal is supplied through a reproducingequalizer 63 and a limiter 64 to abit synchronizing circuit 65 which includes a D-type flip-flop circuit 66 and a phase-locked loop (PLL)circuit 67. The data comprising "1"s and "0"s modulated as described above are derived from the flip-flop 66 and supplied to the PCM audiosignal processing circuit 62 in which the data are detected and corrected for error, expanded to the original time base, and reconverted into left and right analogue audio signals which are supplied tooutput terminals - During reproduction in the PCM multi-track mode, the PCM audio signals reproduced by the heads HA and HB in scanning the areas AP1 to AP6 in the tracks TA and TB, respectively, are supplied through the switching
circuits playback amplifiers 36A and 36B, respectively, to the movable contacts of the reproducingswitching circuit 33. Since, in the PCM multi-track mode, the reproducingswitching circuit 33 is changed-over from one position to the other in response to the switching control signals RFSW which has its phase shifted by an integral multiple of 36° in accordance with the specified one of the segment track areas AP1 to AP6, the PCM audio signal reproduced from the specified one of the segment track areas AP1 to AP6 in the tracks TA and TB is supplied to thePCM signal system 60. In theprocessing circuit 62, the PCM audio signal from the specified one of the segment track areas AP1 to AP6 is detected and corrected for error, expanded in time base, and reconverted into left and r ight analogue audio signals which are fed to theoutput terminals - The output signal from the flip-
flop 66 is also shown in Figure 6 to be supplied through agate circuit 73 to a decoder 74. Thegate circuit 73 is supplied with the index area signal IDAR from thesystem controller 40 as a gating signal. Thus, during reproduction in the normal mode, the time code signal reproduced from the postamblearea 14 of the part AP of each of the tracks TA and TB is supplied through thegate circuit 73 to the decoder 74. Similarly during reproduction in the PCM multi-track mode, the time code signal or data reproduced from the postamblearea 24 of the spcified one of the segment track areas AP1 to AP6 is supplied through thegate circuit 73 to the decoder 74. In either case, in the decoder 74, the reproduced time code signal is demodulated, detected and corrected for error, and the resulting time code data TCʹ is supplied from the decoder 74 to anindicator 75 which visually indicates the position or time along the tape in "hours", "minutes", "seconds" and "frames". - The 8 mm VTR is further shown in Figure 6 to include a
motor 83 controlled by thesystem controller 40 through amotor drive circuit 83A for rotating areel base 84 coupled to one of the reels on which thetape 2 is wound, and amotor 85 also controlled by thesystem controller 40 through amotor drive circuit 85A for controlling the rotation of areel base 86 coupled with the other reel on which thetape 2 is wound. Acapstan 88 for driving thetape 2 in a forward direction indicated by thearrow 3T is driven by acapstan motor 87 which is also suitably controlled by thesystem controller 40 through amotor drive circuit 87A. Of course, during a normal recording or reproducing operation of the VTR, thecapstan 88 is driven by itsmotor 87 to advance or drive thetape 2 in theforward direction 3T at a standard speed with the operation of themotor 87 being servo controlled for accurate tracking of the tracks TA and TB by the heads HA and HB, respectively, which are rotationally driven by themotor 82 under the control of thesystem controller 40 through themotor drive circuit 82A. At the same time, themotor 83 drives thereel base 84 in the direction to wind thetape 2 on the respective reel. On the other hand, for a rewind operation, themotor 85 is operated under the control of thesystem controller 40 through themotor drive circuit 85A so as to drive thereel base 86 in the direction for winding thetape 2 on the respective reel and thereby causing drive or transport of thetape 2 in the reverse direction indicated by the arrow 3Tʹ in Figure 6. - For the purpose of providing an assemble edit mode of operation, the apparatus of Figure 6 is shown to include a
pause button 76 connected with thesystem controller 40. When thepause button 76 is actuated or depressed with the VTR in its recording mode, thesystem controller 40 suitably controls thereel drive motor 83 and thecapstan motor 87 through the respectivemotor drive circuits tape 2 in the forward direction indicated by thearrow 3T, and then to cause thereel motor 85 to effect movement of thetape 2 in the reverse direction indicated by the arrow 3Tʹ through a distance corresponding to a little more than ten tracks of fields, at which point thetape 2 comes to rest with the apparatus in its so-called recording pause condition. With the apparatus in this condition, if thepause button 76 is depressed again, the recording pause condition is released and thesystem controller 40 causes thereel drive motor 83 andcapstan motor 87 to effect transport of thetape 2 in the foward direction and, at the same time, temporarily establishes the reproducing or playback mode. In such temporary reproducing or playback mode, the time code data TCʹ issuing from the decoder 74 and corresponding to the time code signal reproduced along with the PCM audio signal from the area AP, or from the selected one of the segment track areas AP1 to AP6, in the tracks TA and TB being scanned, is also supplied to the time code generator 71. - The time code generator 71 is controled by the
system controller 40 so that, when the apparatus is in its temporary reproducing mode after its release from the recording pause condition, the time code data TC issuing from the time code generator 71 is synchronized with the time code data TCʹ being then received from the decoder 74. Moreover, the apparatus is changed-over from its temporary reproducing mode to a recording mode for recording a new audio or information signal in a track on thetape 2 at a time when the time code data TC then issuing from the time code generator 71 for recordin along with the new information signal is synchronized with the time code data earlier recorded with the previous information signal. - More particularly, in the illustrated embodiment, the time code data TC from the time code generator 71 is supplied to a memory 77 and directly to a first input of a
coincidence detecting circuit 78 which has a second input for receiving time code data read out from the memory 77. Thecoincidence detecting circuit 78 generates a coicidence signal SD when the time code data TC received directly from the time code generator 71 coincides with the time code data TC₁ being read out of the memory 77. The memory 77 is controlled by thesystem controller 40 to write in the memory 77 the time code data produced by the time code generator 71 at the time when thepause button 76 is initially depressed to initiate the recording pause condition. Such time code data written in the memory 77 is stored therein and supplied to thecoicidence detecting circuit 78 until it detects the coincidence thereof with time code data being provided directly from the time code generator 71, and produces the signal SD supplied to thesystem controller 40. In response to the signal SD, thesystem controller 40 changes-over the VTR to its temporary reproducing mode to its recording mode with the assurance that there will be continuity in the time code signals recorded on thetape 2 before and after the change-over. - The above operation of the apparatus will now be described in further detail with reference to Figure 8 in which it is assumed that, during a recording operation of the VTR, the
pause button 76 is depressed at the time t1 at which time the time code data TC1 is being provided by the time code generator 71. In response to such actuation of thepause button 76, the time code data TC1 is written in the memory 77 and, as earlier noted, further driving of thetape 2 in the forward direction is halted. However, due to inertial and/or mechanical factors, thetape 2 experiences an overrun 1a beyond its position at the time t1. Then, as earlier described, thesystem controller 40 causes thereel motor 85 to rewind thetape 2 on the associated reel, and thereby to effect movement of thetape 2 in the reverse direction indicated by the arrow 3Tʹ through a distance of approximately ten fields or tracks. In this case, there is also an overrun 1b as a result of mechanical factors, so that the position of thetape 2 in the recording pause condition cannot be precisely predetermined. - If the
pause button 76 is again depressed at the time t2 in Figure 8, the apparatus is released from the recording pause mode and the temporary reproducing mode is established. In such temporary reproducing mode, the decoder 74 provides time code data TCʹ corresponding to the time code signals being then reproduced from the recorded tracks TA and TB, and the time code data TC issuing from the time code generator 71 is synchronized with the time code data TCʹ. Therefore, at a time t3 at which thetape 2 again reaches the position it had at the time t1, the time code data TC from the time code generator 71 coincides with the time code data TC1 from the memory 77. By reason of such coincidence at the time t3, the coincidence detecting circuit 78 provides the signal SD to thesystem controller 40 which responds thereto by changing-over the apparatus from its temporary reproducing mode to its recording mode. - In the above described embodiment, since the time code data TC recorded with the audio or other information signal after the apparatus has been release from its recording pause mode is synchronized with the time code data TCʹ recorded before the apparatus was placed in its recording pause mode, it will be apparent that the successive information signals recorded in an assemble edit operation in response to the actuation of the
pause button 76 have recorded time code signals associated therewith to form a continuous time code along thetape 2. - Although the apparatus is returned to its recording mode when the time code data TC from the time code generator 71 and the time code data TC1 from the memory 77 coincide with each other, in a modification of such apparatus, the comparison of the time code data TC from the generator 71 and the time code data TC1 from the memory 77 need not be effected. In such case, the apparatus may be returned to its recording mode upon the lapse of a predetermined time period measured from the time t2 at which the apparatus was released from its recording pause mode. Such predetermined time period is selected so that the time code data TC from the generator 71 will be surely synchronized with the reproduced time code data TCʹ from the decoder 74 at the time when the apparatus is returned to its recording mode from its temporary reproducing mode, whereby continuity of the time code data recorded in the assemble mode is ensured.
- It will be apparent from the foregoing that, in a recording and reproducing or editing apparatus according to this invention for recording, in successive oblique tracks on a magnetic tape, at least a first information signal and, thereafter, a second information signal along with respective time code signals, the time code signal recorded with the first information signal is reproduced therewith prior to the commencement of the recording of the second information signal, and the time code signal to be recorded with the second information signal is synchronized with the reproduced time code signals upon the recording of the second information signal after the first information signal, so that the respective recorded time code signals represent a continuous time code.
- Although the invention has been specifically described as applied to an 8 mm VTR, it is to be appreciated that the invention is not limited to such a device, but can be similarly applied to other rotary head-type VTRs.
Claims (8)
tape drive means (87) for driving the tape (2) in forward and reverse directions; and
rotary magnetic transducer means (HA, HB) for scanning said successive oblique tracks (TA, TB) on the tape (2) when the tape (2) is driven in said forward direction and having recording and reproducing modes for selectively recording and reproducing information signals and respective time code signals in said oblique tracks (TA, TB) being scanned;
characterized by:
control means (40, 76) operative, after the recording of said first information signal and the respective time code signal on the tape (2), to cause said tape drive means (87) to drive the tape (2) in said reverse direction a predetermined distance and then to drive the tape (2) in said forward direction while said transducing means (HA,HB) are in said reproducing mode for reproducing said time code signal recorded with said first information signal;
time code generating means (71) for genera ting a time code signal to be recorded with said second information signal; and
means (78) for synchronizing said time code signal generated by said time code generating means (71) with said time code signal reproduced with said first information signal by said transducing means (HA, HB) while the tape (2) is driven in said forward direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP270730/86 | 1986-11-13 | ||
JP61270730A JP2733524B2 (en) | 1986-11-13 | 1986-11-13 | Recording device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0267780A1 true EP0267780A1 (en) | 1988-05-18 |
EP0267780B1 EP0267780B1 (en) | 1991-02-27 |
Family
ID=17490156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87309938A Expired - Lifetime EP0267780B1 (en) | 1986-11-13 | 1987-11-10 | Magnetic recording and reproducing apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US4805042A (en) |
EP (1) | EP0267780B1 (en) |
JP (1) | JP2733524B2 (en) |
KR (1) | KR950014672B1 (en) |
DE (1) | DE3768205D1 (en) |
ES (1) | ES2021371B3 (en) |
TR (1) | TR24588A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0736869A2 (en) * | 1995-04-04 | 1996-10-09 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for recording digital signal and drum unit for recording FM audio signal and digital signal |
EP1383260A3 (en) * | 2002-07-16 | 2009-01-28 | Yamaha Corporation | Apparatus and method for recording/reproducing operation information in association with video or music |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3888126T2 (en) * | 1987-12-14 | 1994-08-18 | Sony Corp | Device and method for recording a digital signal. |
US6714718B1 (en) * | 1989-06-02 | 2004-03-30 | Canon Kabushiki Kaisha | Recording and reproducing apparatus comprising recording means for recording input image signal or which automatically reviews and produces record images, a reproducing system for use with a recording device recording an image input signal, an apparatus for use with a recording and reproducing system which continuously records a plurality of images, and a reproducing method |
JPH04259965A (en) * | 1991-02-15 | 1992-09-16 | Sony Corp | Information signal recording and reproducing device |
US5742730A (en) * | 1995-03-09 | 1998-04-21 | Couts; David A. | Tape control system |
US5760767A (en) * | 1995-10-26 | 1998-06-02 | Sony Corporation | Method and apparatus for displaying in and out points during video editing |
EP0867882B1 (en) * | 1997-03-27 | 2003-12-03 | Victor Company Of Japan, Limited | Apparatus for generating time code signal |
KR100239745B1 (en) * | 1997-04-25 | 2000-01-15 | 구자홍 | Image frame perfect position recording method |
KR100280786B1 (en) * | 1997-12-24 | 2001-02-01 | 윤종용 | Time-lapse recording device and recording method of digital VSI |
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DE3138922A1 (en) * | 1980-10-03 | 1982-06-24 | Sony Corp., Tokyo | METHOD AND CIRCUIT ARRANGEMENT FOR PROCESSING OR. CUTTING AN IMAGE SIGNAL IN A TAPE DEVICE |
DE3227281A1 (en) * | 1981-07-22 | 1983-02-10 | Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa | DEVICE FOR JOINING RECORDING PIECES ON THE MAGNETIC TAPE OF A VIDEO TAPE DEVICE |
DE3247493A1 (en) * | 1981-12-22 | 1983-07-14 | Victor Company Of Japan | MAGNETIC RECORDING AND PLAYBACK DEVICE |
DE3517649A1 (en) * | 1984-05-16 | 1985-11-21 | Clarion Co., Ltd., Tokio/Tokyo | SYSTEM FOR MAGNETICALLY RECORDING AND PLAYING BACK A VIDEO SIGNAL |
EP0176324A1 (en) * | 1984-09-19 | 1986-04-02 | Victor Company Of Japan, Limited | System synchronizing apparatus |
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US4163263A (en) * | 1978-04-04 | 1979-07-31 | Basf Aktiengesellschaft | Method and apparatus for tape recording time-spaced segments of video information from a video camera |
DE2844897A1 (en) * | 1978-10-14 | 1980-04-17 | Blaupunkt Werke Gmbh | INFORMATION RECORDING AND DISPLAYING DEVICE |
JPS6025820B2 (en) * | 1979-07-25 | 1985-06-20 | 松下電器産業株式会社 | Recording/playback device |
JPS5693159A (en) * | 1979-12-25 | 1981-07-28 | Sony Corp | Error correcting system for advance data |
-
1986
- 1986-11-13 JP JP61270730A patent/JP2733524B2/en not_active Expired - Fee Related
-
1987
- 1987-11-04 KR KR1019870012362A patent/KR950014672B1/en not_active IP Right Cessation
- 1987-11-09 US US07/118,318 patent/US4805042A/en not_active Expired - Lifetime
- 1987-11-10 EP EP87309938A patent/EP0267780B1/en not_active Expired - Lifetime
- 1987-11-10 ES ES87309938T patent/ES2021371B3/en not_active Expired - Lifetime
- 1987-11-10 DE DE8787309938T patent/DE3768205D1/en not_active Expired - Lifetime
- 1987-11-13 TR TR87/0781A patent/TR24588A/en unknown
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DE3138922A1 (en) * | 1980-10-03 | 1982-06-24 | Sony Corp., Tokyo | METHOD AND CIRCUIT ARRANGEMENT FOR PROCESSING OR. CUTTING AN IMAGE SIGNAL IN A TAPE DEVICE |
DE3227281A1 (en) * | 1981-07-22 | 1983-02-10 | Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa | DEVICE FOR JOINING RECORDING PIECES ON THE MAGNETIC TAPE OF A VIDEO TAPE DEVICE |
DE3247493A1 (en) * | 1981-12-22 | 1983-07-14 | Victor Company Of Japan | MAGNETIC RECORDING AND PLAYBACK DEVICE |
DE3517649A1 (en) * | 1984-05-16 | 1985-11-21 | Clarion Co., Ltd., Tokio/Tokyo | SYSTEM FOR MAGNETICALLY RECORDING AND PLAYING BACK A VIDEO SIGNAL |
EP0176324A1 (en) * | 1984-09-19 | 1986-04-02 | Victor Company Of Japan, Limited | System synchronizing apparatus |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0736869A2 (en) * | 1995-04-04 | 1996-10-09 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for recording digital signal and drum unit for recording FM audio signal and digital signal |
EP0736869A3 (en) * | 1995-04-04 | 1997-03-05 | Matsushita Electric Ind Co Ltd | Method and apparatus for recording digital signal and drum unit for recording FM audio signal and digital signal |
US5949598A (en) * | 1995-04-04 | 1999-09-07 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for recording digital signal and drum unit for recording FM audio signal and digital signal |
US6125001A (en) * | 1995-04-04 | 2000-09-26 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for recording digital signal and drum unit for recording FM audio signal and digital signal |
EP1383260A3 (en) * | 2002-07-16 | 2009-01-28 | Yamaha Corporation | Apparatus and method for recording/reproducing operation information in association with video or music |
Also Published As
Publication number | Publication date |
---|---|
TR24588A (en) | 1991-11-27 |
JPS63124288A (en) | 1988-05-27 |
KR950014672B1 (en) | 1995-12-13 |
ES2021371B3 (en) | 1991-11-01 |
JP2733524B2 (en) | 1998-03-30 |
KR880006688A (en) | 1988-07-23 |
DE3768205D1 (en) | 1991-04-04 |
EP0267780B1 (en) | 1991-02-27 |
US4805042A (en) | 1989-02-14 |
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